(628f) Ionic Liquids Based Composite Membranes for CO2 Separation
In this work, a series of phosphonium based ILs ([P66614][NTf2], [P66614][DCA], [P66614][Triz] were synthesized and blended with polyether copolyamide (Pebax) to prepare IL/Pebax composite membranes for CO2 separation. The results showed that the [P66614][NTf2]/Pebax composite membrane has the best performance, with the CO2 permeability up to 244.3 Barrer, when the IL content reached 40 wt%. With the increase of IL content, the CO2 permeability of [P66614][NTf2]/Pebax composite membrane increased. In order to further improve the separation performance and strengthen the mechanical property of the membranes, ZIF-8 porous particles were added to form three-component composite membranes and the single gas permeability and CO2 selectivity was systematically investigated. The results showed that the gas permeability of the membrane increases as the content of [P66614][NTf2] increases. When the content of [P66614][NTf2] reaches 30 wt% and the content of ZIF-8 is 10 wt%, the CO2 permeability of the membrane is up to 386.8 Barrer while the CO2 selectivity keeping constant. The various characterization including FTIR, DSC and SEM revealed that the addition of IL increases the free volume of the membrane and reduces the agglomeration of ZIF-8 particles, which promotes gas diffusion and hence improves the CO2 permeability of the membranes.
1. Zeng, S. J.; Zhang, X. P.; Bai, L.; Zhang, X. C.; Wang, H.; Wang, J. J.; Bao, D.; Li, M. D.; Liu, X. Y.; Zhang, S. J., Ionic-Liquid-Based CO2 Capture Systems: Structure, Interaction and Process. Chemical Reviews, 2017, 117: 9625-9673.
2. Dai, Z.; Noble, R. D.; Gin, D. L.; Zhang, X.; Deng, L., Combination of ionic liquids with membrane technology: A new approach for CO2 separation. Journal of Membrane Science, 2016, 497: 1-20.
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